Finished it!!!
It was very much enjoyable to play and has a good concept!
The enjoy factor comes from seeing your past selves fighting all the enemies, it could possibly be even upgraded in the future to be much more interesting.
The concept itself was also amazing and unique, not too much games have this sort of mechanic.
The weaker side of this game was in the visuals and audial elements, or the overall presentation. Although the sound effects felt goofy and funny, it lacked satisfaction to hear. If you are really going for this goofy sort of self produced sfx vibe, better takes could improve the sfx of the game. For the art, it isn't bad to look at, what I meant by visual was that the animations felt lacking and could have been improved. You could also add post processing to improve the game without having to be artistic in drawing or painting, just don't overdo it!
Overall, amazing job! Unique and enjoyable concept do make a great pair, good luck!