Nice work. I think the jumping could use a bit more force. It was hard to jump from the ground up to platform/piers. Or that's what I thought would be more fun to do.
I didn't particular like the field of view. Felt like wall-eye vision or tunnel vision. I got motion sickness at the beginning but then got used to it after a minute or 2.
I like the canons aspect but they would do more proximity AoE damage I think.
Also, I think the music and sound effects sell me on keeping on playing and trying to outscore myself.