This game concept is really cool and unique!
At least I hadn't encounted something similar before. The art was also nice and funny. My only real feedback is to increase the contrast against the background a bit for us with bad eyesight.
If you keep improving it, I would be very interested in seeing a full game, even with the mechanics as are - albeit maybe with a bit more balancing.
In terms of balancing, I must admit that it was too hard for me despite repetitive attempts: it seems that I was always on the negative resources to stay alive and thus couldn't go past the 5th slime. But maybe I wasn't understanding what I was supposed to do correctly - a short youtube video in the game page would probably help a lot.