Honestly nice concept. But....omg did I wanna rage quite so bad x(. But ye. if u just starting this ain't bad. Keep it up.
Definitely look into (when u have time) how to fix the bugs. Cause a puzzle game with bugs...isnt really the best. felt like the mechanics weren't really consistent. (getting stuck on the floor is prob because you didnt use a tilemap collider)
A good rule of thumb is to make the enemy hitboxes smaller than they seem. that way it's less lightly the player feels like there was an error. An "OMG I BEARLY DODGED THAT" is way better than a "wtf, I didn't even touch that"
For puzzle games, it's best that the player feels in control. So making the floor slippery....ye. Either add friction or directly modify the player velocity.
ps: triggers are cool :)
pps: have a fabulous day