At first I wasn't sure about this game but after the recoil shot I fell in love with that mechanic. It was a lot of fun to do a double jump and then three shots to get some incredible height. I also am not sure if this was intended but you can shoot one way with the gun and quickly switch directions and gain some incredible speed. Making some levels out of that mechanic could be really cool. If it wasn't a feature then it should be because it was great fun.
I would also say that some sound effects for hitting things would be nice especially because I couldn't tell if the recoil shot did more damage than the other one. I assumed that it did because the bullet was larger but I wasn't sure.