I had an endless number of ideas for player skills, weapons, and enemy attacks. Unfortunately, I didn't have an endless amount of time to implement them.
At first, the player was supposed to get new skills after defeating a boss, such as double jump or wall jump. These skills would then be needed in subsequent battles.
I had to limit myself greatly because writing all the scripts, finding sounds and models (which I then had to texture) for the weapons took a lot of time to complete.
I tried my best, and I hope it was enjoyable enough to play.