Ok, so... few tips:

- if there are many slimes, you might wanna zoom out the camera more, because i was wondering why i cant merge. it turns out 1 slime was missing. Players should know where all slimes are at all times

- the camera should at least keep up with the slime's speed, instead of being too slow. I moved faster than the camera, and before I could read the "try to avoid... etc", i already died. This doesn't feel nice.

- maybe reduce number of slimes, the chance of player error can be reduced and make it less frustrating

Good try though. it's a good concept. Just needs some finetuning~ Also, since it's your first game, welcome to game dev!