Following some feedback from the community, we've made several changes to the game:

• We've removed the waves, making the game one continuous battle
• Difficulty ramps up quicker, making the game more about short bursts than marathon sessions
• Scoring ramps up faster, so you'll get higher scores from shorter sessions

Collectively this is all to make the game more of a classic arcade experience, something played for short blasts and replayed for higher scores.

Let us know what sorts of scores you're getting!