Thanks for playing ^o^
Bacon and I are working on an updated version with more features - such as controller support, new characters, modes and music, etc - and many gameplay changes, including a new attack and stronger enemy variants.
I actually wasn't aware of the window resize option but it's been enabled for the new version (why that isn't selected by default I do not know xD), and as for the comments on pacing, I'm having a look to see if I can find a way to maybe increase down time between waves, so hopefully that improves it a bit.