Really good, although I have a few criticisms:
1. Double jump is very finnicky. It's almost a gamble whether I double jump or just plummet.
2. The big giga-chad robots take just one headshot with the revolver to kill. This is a little bit too easy. Maybe make it so that when its head falls off, it kinda grows legs and starts walking around and shooting you on its own, to make it just that much harder to kill.
otherwise, very good!