This was a cute game! I really liked the mechanic of changing surfaces, felt pretty unique and cool.
I got stuck twice, though, I couldn't move no matter what I clicked, both times happened after exiting the "brainy stages". I also felt that the melee did nothing? But it maybe was my game skills haha.
There were also some parts where I felt that the foreground was obscuring the tentacles so I ended up taking damage by a hidden tentacle, but that could have been as designed.
Overall, I really liked the gameplay and the idea! With some polish, it can turn great.