Thanks for your feedback! Here's some things I've already done and are in my changelog. :)
- Made some improvements to Hex's movement, it should feel less floaty and jumping up slopes should be more lenient, although you still have to work with the geometry of the level to not lose momentum and if a slope is too steep, you will still fall off
- Changed the exaggerated post-processing effect around the portal to only be active when the portal actually spawns
- Changed the appearance of shards and artifacts to stand out more (the latter are hidden collectibles)
And that's a very small chunk of the changes and fixes haha. The thing with the colours being somewhat monochrome in the game right now is intentional, because later on there will be many more enemy types and Agon (the little companion) will be way more powerful. And all of these things will have unique colours to them - and because the screen can get pretty cluttered at times, I wanted to design the environment as cleanly as possible so the players always have audio-visual feedback on what's going on. It may feel a bit stale for now. But it will all make sense later. :)