Neat idea, nothing new on the table but I like the little details that you play as the reaper and the music fits excellent imo. I imagine if the mechanics were more crisp and fledged out and faster, that you could really make a cool speedrunning game like MattressD said. Chaining dashes and walljumps and dimension shifts make for some cool strategies. I also like that you already could solve some levels other than how it was "intended", since im a big fan of speedrunning and games like celeste/meatboy.
Keep up the good work :)