I played through what was available.
Some feedback:
1. It seems like there's variable jump height, whihc makes jumping up to a fixed spear a little hit and miss sometimes. 14:15 and 15:00
2. Perhaps a thicker, darker outline for the text to make it stand out against brighter backgrounds. The start of the game and 12:15
3. Upper floors of the forest biome look like they're connected to the lower floor according to the minimap.
4. Unclear what the purpose of gem fragments are.
5. Breakable blocks not very visually prominent.
6. Slipping off end of wall-spear-platform. Not ideal for a platformer. 5:45
7. The Human/Seed transition needs to be HELD but the control scheme doesn't make that clear, nor is there any animation/gauge to suggest that it needs to be held to make it clear that it's non-instant.
8. Upwards tile colour (the top of crawlspaces, etc.) blends into the bottom of the forest BG decently. The buzzsaws seem to have a similar visual issue with the cave BG. I was watching this back on youtube though, which has it's own compression issues.
9. I know it's a WIP, but does the shortcut at 10:55 need to be blocked up and require an ability that you only get towards the end of the demo?
10. VISUAL BUG - Visually duplicated spear 12:34
11. Seed Bomb is obtained after beating 2nd boss, yet hint mentions a dash immediately afterwards. Another post here mentions getting a dash and double jump so I assume I missed them somewhere(?). Seems odd for the new power-up to NOT be the first thing you'd have to use right after getting it.