The mortar as the core combat concept feels like it has a lot of potential, but for some reason just never felt like it clicked to me. Maybe it didn't feel like there was enough feedback on the hit, I dunno. I also found all the boss fights either incredibly easy (stand in a safe spot and spam shots) or incredibly difficult (constant attacks that felt almost impossible to dodge while actually returning damage), and regular enemies felt just kinda tedious to fight with their unpredictable movements.
To be clear though, I do love the idea of the mortar; and I love a cute gal with huge guns! I think with some work on that you'd have a really fun to play character, and that's before we get to the platforms.
It took a while for the platforms to click, but when they did they definitely felt like an enjoyable way to move around the space. Something about them always felt a little clunky or janky, but not so much that I was frustrated yanno? With a couple platforms available to me it was enjoyable to look at where I wanted to go and ask "how can I put these pieces together to get there?"
I'm not entirely sure how well the platforms and the mortar mesh together, but both are systems with a lot of potential that could become really excellent if you find out how to really marry the two.