Hi everyone!

I just released Gravity Core, a short portrait-mode survival game made for phones, playable free in the browser:

https://shaochhii.itch.io/gravity-core

The hook: you don't aim or shoot. Hold the button and a gravity centre locks two body-lengths toward the nearest enemy cluster — everything in range gets dragged inward. Release to detonate, and the blast chains outward up to two more times. Hold too long and it fires without you, and every shot costs a 4-second cooldown, so each pull is a commitment.

What's in it:
- One arena, three enemy types, six upgrades, three difficulty presets
- A 5-minute run with a clear win/lose loop and a local best score
- Every run has a seed code — enter the same code to reproduce the same run
- Fully offline: a single HTML file, no ads, no analytics, no network requests
- Bilingual (English by default, switch to Chinese in-game); works with touch or mouse

I'd love honest feedback especially on the core decision: does the hold-to-gather / release-to-detonate timing feel good, and is the chaining readable when things get crowded?

Thanks for playing!