Ok, I see the idea and great attempt for a first game. I love the enemy design but a lack of context overall. Besides audio and feedback, I'd say the reality shift needed more design care. I can shift realities and completely ignore enemies, then when there are enemies in the shift, I just switch back. There is a cooldown on the shift to the alternate reality but I felt it was too long and not represented anywhere, there's also no cooldown switching back so it's not consistent. The end portal is also not represented in the alt reality so I walked into a room and just won.. kinda odd. I don't mean to rip, but as you said it was your first game I wanted to give honest feedback that hopefully helps you out, cheers.