I had a lot of fun with this! the time travel effect is super cool, and you used the mechanic to make some really interesting puzzles and enemy combat. I need to figure out shaders... Overall really polished and impressive for the "timeline" you made it in:)
my advice would be to have the game reload automatically, or at least have an onscreen prompt. I definitely missed it in the tutorial and restarted a few times because I thought it had crashed.. I beat the boss and all the enemies in the room, but I didn't get a win screen or anything so not sure if I missed something? It would also be cool to have some player animations if you decide to keep working on it. well done!