Made enemy spawning location more obvious prior to spawn
Added some dark backgrounds to a couple UI elements (mode matrix and leaderboard)
Increased brightness of sliders in option menu
Made menu background not get quite so bright
Updated background/music flashing to ignore volume of music
Updated achievement destroyed count to count enemies being destroyed on wall deaths too
Also added 3x bonus for killing enemies with bombs, 5x (+2x more) for kills that create a nova
Fixed arena size in very high waves (30+) being too tall vertically (enemies couldn't reach player)