Thanks a lot for your comment and feedback!
You can actually aim by holding the spacebar, which reverses the direction of your shots. The idea was to make it a unique mechanic, but it seems like it ended up being more frustrating than fun—you're not the only one who mentioned this! It might also be poorly communicated in the game. Out of curiosity, did you know about this mechanic before, or was it unclear?
Also, thanks for the dev tip! I never really thought about that, but it makes total sense. This is actually my first game ever, so I'm still learning a lot! :)