Lovely! I'm a sucker for games like these, especially with multipliers, so this one is right up my alley. I'm not entirely sure how the theme of big plays into it apart from getting a big score or a big horde, which is cool too! I love how the prerequisite has been handled though, having to swap between the two to make sure you get power but also are able to kill enemies is interesting.
The juice is very nicely done too, and the powerup is insanely satisfying! The UI could use from extra flair, especially the end screen, to give the scores that bit of extra umpf. Having the background be a bit less repetitive could be nice too. Overall though, incredibly solid and super satisfying wave shooter :D
My score > 971660 / 2:29