Played two runs.
First time I played, had a lot of fun! I like that there are different characters to choose from, I played shadow and fire. It took me a while to learn how to aim, but once I learned to not panic and take my time to aim, it was smooth sailing.
This might be odd, but I didn't find a good reason to get elevation. It made it harder to aim, manouver around obstacles and pick up upgrades.
Picking up upgrades felt difficult and swapping the weapon I was currently using made it a bit too risky.
I got instakilled by a fish trapping me against a wall. Invulnerability frames would be welcome.
I wanted to adjust mouse sensibility during the run, I'm sure this is on your todo list though.
Once I found a weapon that was my secondary but on low cooldown, it was game over. I recommend you to watch the video, because the run was abandoned after a naty camera bug.