Really fun and innovative design! I found the puzzles really creative and challenging. The visuals / audio is also amazingly put together.
The first levels introduce the mechanics really well. Could just be me, but I assumed on the second level that the save point would be erased upon hitting the spikes, maybe instead of spikes, have a portal that takes you back to the spawnpoint? Or an indication that it simply returns you to the start, considering it's the only time that mechanic is used? Again, could just be me.
Also the menu button at the end doesn't appear to work.
Really hope you expand and create more levels, this was really fun! :D