I’m not sure if it’s just the web client, but I had some problems with shooting working. It seemed as though there was a timer on how fast I could shoot or something like that. Overall, I think there’s a lot of games like this, and it might be hard to stand out from the rest just because it’s christmas themed.
I would suggest perhaps speeding up character and enemy movements and projectiles. For example, the enemy that shoots a skull at you is too easy to dodge. Also, the UI looks a lot like a mobile game, which if that’s what you’re going for then great. If you are primarily targeting desktop users then maybe make it more simple or maybe more keyboard friendly.
I do think the modifiers from the slot machine are a good idea, and the values seem right.