Hi, I'm Acuristic. Here's some feedback on your game:

Things I like:

• Game Design: Despite the game being so simple, it's really fun and engaging. I really liked the "human evolves" mechanic, and I would love to know how you managed to make such a thing in under 8 hours.
• Polish: The death particles, and the arrow in the direction of the movement of the boss's parts, the hit flash, and the eyes looking towards the humans make the game feel suprisingly polished.
• Human Ai: The human's Ai is very thoughfully coded, as it allows the humans to roll and turn back only in the later waves.

Things that need more polish:

• Strategizing: I really like how there are different approached to killing the most humans, but there is a small "flaw" that allows you to completely overpower the humans for the most part (till  all the boss's parts are intact)This position allows the player to keep spamming the 2nd last tile and kill humans. This can be fixed if you make the humans spawn from the other side too, or by making humans attack the tile which has the most chances of killing them (i.e the tile above them, in this case)
• Lack of enemy types: The game gets quite repetitive after a while, so adding enemy variations (even randomly coloured enemies can break the evenness).

But other than these stuff, the game is quite fun, and the controls are so simple that I didnt even need a tutorial to understand them, Really good game!