Pixel art looks good, movement feels good.
There did seem to be some collision issues on most main gates, as I could just run through them. And the jump height was a bit inconsistent, making me believe that I could not reach certain platforms, though I did figure it out after some time. I like that you start with a rather powerful weapon, it feels good and I feel in control of the weapon. The second weapon didn’t seem to do anything, but maybe that’s me.
Also I too got stuck on the right.
The chest pickups were a bit of guesswork with what was inside of them, though reading all possible keys to use, I could figure it out.
Would’ve loved some checkpoints or text skips as it ends up making exploring the demo a lot easier. But for what’s currently available, I liked it!