After adding more features, doing fixes, creating more enemies and bosses + rebalances, I've decided to release the updated version (link in first post)!
This version has:
1. Fixed strafe shooting
2. Extra mode called : Cursed Crystals. In this mode, cursed crystals appear on the field. If touched, crystals will appear and so more enemies.
3. More enemies and palette order to show their HP.
4. 2 more bosses.
5. More upgrade cards, including extra shots: Banarangs, Semangka Shots and Rambobans.
Enjoy the updated game!