I got nearly 2k. The game is a solid start, but needs a lot of improvements. Some suggestions:
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Power ups and evolutions (bullet penetration, more damage, shield, defense towers, etc, etc… There are a lot of games with this mechanics.
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Incremental (spend points to buy permanent or temporary skills with different levels).
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More enemies (variety, life points, movements…)
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A little story. My idea is that the story of a game makes the diference between a lot of clone mechanics…