Its Insanely impressive that this game out of a game jam, I think the idea and story for the game are both very interesting concepts and seeing your reverse copy for the first time was a great surprise. However it definitely felt rushed and very quickly got repetitive, the upgrades are not really needed and so you immediately run into just doing the same thing over and over with little to no change, your past self isn't really a threat as there is no penalty to hitting them.
The concept is brilliant and has a lot of potential, and I do hope you explore that potential and keep working on this post jam because I really like the idea of farming in backwards time.