Cool game. I looked forward to playing this one as I saw you make progress on discord.
1. I really don't like the controls how you have them mapped. I think using something like wasd and ijkl would be a great pairing with mirrored jump and pickup buttons.
2. I like the puzzle aspect, its fun, but the platforming aspect is very meh. That is okay, since the focus is puzzles, but having to restart because you hit a spike is annoying. If platforming is important, make that aspect more fun and in depth, then it would seem fair to have to avoid spikes.
3. I like the art, but the black guy is hard to see. I would suggest a light colored outline our similar effect to make it easier to see.
Thanks for making the game! It is fun!