Interesting art direction, really like the consistent look! I kept naturally wanting to hold LMB and keep moving towards the mouse… but I had to keep clicking instead. A simple improvement would be to check mouse holds rather than mouse presses.
But pushing further, the mouse controls might not have been the best fit for the run and gun level design. It’s hard to make dodging projectiles enjoyable when you cannot move around and shoot at the same time. Besides that, great looking entry with pleasant colors!