First of all: your game is awesome, the idea of switching between monsters to activate certain "skills" is really cool and creative.
Now for the feedback
- I noticed there's already some sound in the game, but the introductory text says there's no sounds at all
- Was I supposed to double jump in the air when switching from the little ghost to the pink blob?
- It's not very clear what the left-mouse button skill is when you're with the ghost
- The falling leaves have an inverse behavior: when you fall, they fall faster, when you move up, they fall slower
- I got stuck for sometime on the shop menu as soon as I clicked a monster to inspect at the garden (I didn't know how to do anything else and it's not very clear what to do here, but I managed myself out of that screen when I started a mission, but I couldn't figure out how to equip or buy a monster besides the ghost and the slime)
- If you select a monster on the shop then type 1 or 2, sometimes the camera moves to position 0, 0
- There are some very hard (or impossible) parts to get by without getting damage at the meat grinder level (on the green smoke stuff)
- There should be a counter of enemies killed on levels where the mission is to kill certain amount. I played one for over 5 min and it felt like they were infinite
Overall the game is very promising, looks awesome, feels good and its very creative, with very complex routines, such as the upgrade store and mission system. Congrats, I'll sure be willing to see the full version.