I really enjoyed this and I think the controls are fine! My only complaint is the text bozes at the start that pop up and pause the game while they're there. It's such a minor thing but it makes dying very frustrating and they don't really tell you anything useful. They should at least stop displaying after the first time you've seen them. It would be nice if the bullets were easier to see as well, maybe they should be a different colour/shape? The music could also use a little work, it's very messy sounding.
But yeah, it controls well, it's fun and the Superhot concept translates to the early 90s FPS style really well! Great work :)