I'm sorry about some of these issues. I guess sometimes you just play-test your own game so much that things become second-nature. This game has a lot to it in terms of complexity compared to my previous games. It had a lot of problems near the end, so I had to kind of push it out as it was. I would have considered more player reactions to the different mechanics if I hadn't had those problems. I was glad that I was able to get it in working, playable order. I'll try to address some feedback specifics.
I don't know how I forgot to mention click to shoot. I added some additional instructions on controls to the game's page.
The ESC ends games thing is a trope of mine. I'm starting to think other people don't like that, but I personally prefer a single button to immediately end a game. If this was a bigger game with saves, loading, etc, sure, I'd have more with menus/esc menu, etc. I updated the game page on ESC.
Drops in the game work randomly, by killing an enemy you either get bullets, health, or money, it shows a little popup above the status bar for which one you received. Bullets are also in the environment in red boxes. There's one on the table. There are others that are hidden in secret areas. And also, in the dance hall, there is a machine that converts health to bullets. There should be enough bullets in the game, even not using the secrets. This game can be played with different playstyles and it can be rushed through. You don't get penalized for not killing the majority of the enemies, so you can save on bullets that way, like in a Resident Evil game. The only enemies that need to be killed are the ones that appear in the dance hall in a sort of rush/boss fight.
This game was a test for me making this type of game. I'm not sure I'll continue this specific project. But, I'll try to take forward the advice of consistent controls and being sure to mention all controls on the game page in future projects.
Thank you for your feedback. I'd like to see your video when it's posted, thank you.