It's mostly nice, but having to restart when you accidentally hit spikes makes it extremely frustrating. My advice is either to remove them or add checkpoints. Your later levels might be really fun. I guess I'll never know.
The Spikes are there to make the game more interesting and honestly while developing i wanted to make the game feel more like a platformer less and puzzles since most of the puzzles are pretty simple to solve. The Spikes add a fun level of difficulty and prevent you from compleating the game in 1 minute :DD, Anyways sorry if some jump were too difficult, but I was more going for the feeling of happiness when you complete a really fun level instead of just solving some easy puzzles and being done with it.
I think the big difference with platformers is if you die and have to start over, the level is still a challenge and it takes several tries before it becomes annoying. With a puzzle, it stops being a challenge after the first time you do it and redoing it is always annoying. I think the idea is okay, but you need checkpoints to keep you from having to redo sections you've solved just because you missed a jump. Try to make it so death only makes you redo platforming.