I really like these mechanics :) Cute art as well, simple tileset but it all works well together. I need to sleep so I didn't get past the water level. The different abilities definitely have their best use cases which keeps things interesting.
I will say that out of the three slimeballs, the teleport was the one I wasted the most often by throwing it into the ground.
I did manage to teleport myself into a wall (If it's set up with a tilemap collider and a composite collider, setting the composite collider to polygons might fix that)
The jellyfish do sometimes hang out right next to the spikes and sometimes it takes a bit for them to come out.