Great game, simple to pick up and very fun to play. The graphic, along with the announcer voice, feel very authentic. Gameplay is pretty creative too. However, I have some 2cent that I think may improve the game more:
- Multiply the score by 100 (and maybe add combo). I see the Hi Score has a lots of digits, yet everytime I defeat an enemy, it only give me 5. It could be give 500 or 5000, so it would feel more sastifying (and justify the massive HI SCORE digits)
- SFX unbalanced: Alien growl and explosion sound significantly louder than the game BGM and announcer voice, which make it a bit annoying.
Other than that, great work!