I've played this game as promised. Here's my best result before I get bored:
In general, the game is good but it needs many improvements to make it better.
Here are my feedbacks:
1. Please remove the AI generated image above. Half of the information is false there.
2. Red enemies should use red color for their projectiles. This is to prevent conflict with gold items.
3. Speaking of color, heart items should be blue color to prevent conflict with red enemies.
4. Remove the light FX on score. It doesn't serve any purpose AFAIK.
5. Enemies should not spawn in instantly. They should give clue or fade in to give chance to player to react.
6. Enemies spawn should start at low number then gradually get higher and higher. This is to give easy start for new players and give challenge for good players who could survive long.