Not really fan of platformers, but this one has very nice visuals, good SFX and a soothing soundtrack. I think it paces out the introduction of new mechanics well, though I wouldn't have thought that Dash gives you a general speed boost instead of moving you once. I had to die a few times to the second bladewall to figure it out.
Tutorial button prompts could be a little bigger and different color than the parallax in the background. Didn't always notice them when they were there.
Sometimes the "jump to next level" doesn't work if I press anything else beyond the prompted buttons. Then I can only return to the main menu and start again.
Nice touch that you can pick the scaling in options. But it really makes me wish there was an option to rebind controls for those of us with keyboards that doesn't has Z close to X and C.