I really enjoyed your game! The rest of this comment might sound really negative, but don't get me wrong! I really really like the game, I'm just trying to point out what's wrong, or what could have been done better.
- automatic respawn, or respawn with the keyboard. Out of everything this was the most annoying thing. I always had to take my hand off to click with the mouse. It was kind of annoying
- Some softlocks in some levels. These areas are where you can't continue, but you also can't die. Pretty annoying.
- Unforgiving small enemies. I noticed this in the last level at one place where if you fail a jump, it looks like you should have killed the dude below you, but instead you just die to him.
- Unresponsive jump. I don't know how to explain this one, but there were some times where I was pretty sure I pressed the jump button, but I was a milisecond frame off, and the green dude didn't die.
- Weird bossfight. I went for the upper route, and I could barely see the boss at the end... it was weird and kind of unsatisfiying.
- Camera is centered on the player. Imo that's bad. I don't know if you played geometry dash yet (which you totally should if you enjoyed making this game), but the camera is always in a position that you can see a lot more of the future stuff, instead of the stuff that you already completed (so relative to the camera the green dude should be on the left side).
- Bigger score display. It took me 20 tried to finally notice that there is score in the game. From that point, trying to get a high highscore was fun, but you maybe should made it a little bit bigger so we can notice it more easily
- Some enemies disappear, others don't. This was very confusing. Sometimes I jumped on an enemy, and it disappeared, while other times it didn't... it was quite weird...
- Not much of a speedrun. It is kind of easy to get the fastest time... slopes do give you a little challenge, but really it's pretty easy to get the fastest time, and so there really can't be much of a speedrun competition (other than glitch hunting)