the art was nice... the premise was interesting, I think the game itself needs a little more work (but then don't all of our Jam entries). It wasn't always clear what was happening (ie was I doing  any damage to the spider was it doing any damage to me), but, it's a really nice start especially for a first project "That's the first project I feel like I could call somewhat acceptable at least in its prototype phase".

It's obvious you have some great ideas and a lot of artistic and game design talent that with more honing will make some really kick ass gams!

I liked the art, but there were a lot of things that stuck out and made it hard to keep my attention. Since you're new to programming, I recommend you keep practicing and learning. With experience in pixel art, I can see you making some solid jam games in the future.

Some things to keep in mind for the future

• Feedback to the player - A player wants to know if they're doing something successfully (or unsuccessfully). If I'm attacking something, I want to know that my hits are confirming or if I'm being hit for example. Not only is it helpful to the player, but it can be satisfying as well. So in this case, sound and visual effect really come into play here. I'd argue that, for game jams, having that is more important than having music.
• Camera placement - in any kind of platformer, you want to make sure the player can see enough around them so they can assess where obstacles/platforms/enemies are at. Player's don't like making "leaps of faith" because they can't see anything below them that they have to drop/jump to.
• Guiding the player - You want to make sure that the player doesn't spend time trying to figure out your basic mechanics. If you have something that isn't immediately clear, you need to convey the information in some kind of way. Like when you get an unlock, it's nice to have something that tells you what you unlocked, what it's main function is, and maybe a little hint at what it could also do that may be part of a puzzle down the road. In your game, I had no clue what was going on with the attack/jump. If i was in water, I shot projectiles, but out of water, I could jump. However, I had no idea how that mechanic was going to be used.

These are just a couple pieces of advice that immediately come to mind. If you keep this kind of feedback in mind, you'll get better at this. Congrats on submitting, though! I hope you keep working on developing your skills!

the animation of the main character was very good

This was cool, good job on the art. I played as much as I could but it just wasn't engaging or really fun. I'm a stickler for sound and there was none, so it kinda hurt my overall enjoyment. Still, good job getting something playable and submitting it, that's a lot for game jams. Don't give up! I bet this could be killer if you finish it and get some sounds in there.

Cool work you have all the basic thing for platformer game, try to view some tutorial to make a better physics. Cool to have a boss for the end of the game.

That is some *beautiful* sprite work in your art, especially for a beginner. Unfortunately I couldn't play the game (web version)--I clicked "run game" and none of the inputs worked, so I can't rate gameplay. 

Played the game, and I like the swapping-powerups idea, but it had the effect of making the non-powered character movement feel sluggish and 'not fun', which made me not want to use the poison powerup that much. 

Might I offer some pixel art advice? Use a consistent scale--make sure the sprites, background, and any other objects use the same pixel count per tile. It'll make your art look even better, first of all, and will also be more authentic. Shading is also important, as is learning what objects look like IRL to be able to better duplicate them digitally.

It's such an interesting game ! I'm in love with the main mechanic. I'm not sure how I managed to beat the spider boss but it was a nice experience overall. The camera is a little bit too zoomed in. That makes the game claustrophobic but it's kind of a good thing I think.