Liked this game a lot!
Graphics are minimalistic but still detailed enough, I like the little details like the shadows on the ground, the shiny floor effect etc...
Audio totally fits in with this game and the graphics, the music gives a good vibe. Sound effects are also great.
Level design was good. Build up slowly and editng feature by feature. Not to hard but also not to easy. I also think there are always multiple ways to do it wich is good for replayablity. For a 7 day jam there are lots of levels.
User Interface is clean and looks great. The sounds and transitions make it very satifying to even switch between screen :). The only thing what could improve here is making the main menu a bit more alive instead of the plain background. And to go really into the details there are maybe to more thing, make the UI a bit smaller and the transitions a bit faster (these are very small details). Another thing I came across is the last screen from level 17/end. When you exit there the screen doens't close, maybe that one is already fixen since it's a small one to fix.
Gameplay feels good. I like the idea behind this game and it's a original concept wich you can easily expand on if you wanted to make it an even bigger game.
Overall a fantastic game. Normally I'm here to give feedback on what to improve but there isn't much to talk about here :). That means you guys did an amazing job and that in only 7 days.
Congrats to the whole team for making this game!