Fellow mobile dev here. Some thoughts from the page and the thread: "parasite inside a dead colossus" is a great hook, and the tag set (twin-stick, touch-friendly, roguelite) sells it fast. On your stick question: on landscape phones floating sticks that re-center wherever the thumb lands usually fix "losing the stick" far better than fixed ones — if yours are fixed, that's the first thing I'd A/B. For boss readability, a ground telegraph (tinted zone) plus a ~0.5s wind-up tends to read better on small screens than particle tells alone. One page note: the thread says 0.6.18 but the page is 0.6.20 — worth syncing so testers know which build to report on.
If you ever want a mobile swap, I'm running a closed test for a merge tower-defense: https://deunastudio.itch.io/beacon-breakers-merge-defense