Hey, first of all great job! I enjoyed the game and I wanted to point the things I most enjoyed:
- The enemies are all unique and thematically fitting, and they managed to prove challenging at times. Can't wait to see more garbage bags trying to smack me around.
- The art is fitting for the theme of the game: a world full of garbage should be bland and dull, but there is some colour here and there. I liked the interaction with the cactus, which shows that not all is lost.
- I enjoyed the boss fight and am glad it wasn't just another garbage bag, it was a rather creative choise. I just felt that it was a bit too slow and not that much challenging, maybe if it was a tiny bit faster.
- I like the duality of the scraping mechanic where you can use it to reload and heal.
Something that I'm not sure whether it's intentional or not but I found a bit annoying was the movement. It mostly felt good and I love the amount of polish that went into the jump (I love variable jump height in games!), but at times it felt a little bit too "slippery" especially when jumping on smaller platforms. I think a tighter movement system would fit a platformer better.
One last thing, I noticed some flickering and clipping textures in the background at times and the camera transitions were a bit too fast in some locations. But these are small nitpicks which are understandable for a demo and I'm sure they'll be fixed.
I'm curious to how you'll expand the game and I wish you good luck!