v0.4.1

This release is primarily focused on performance improvements and targeting a stable 30 FPS. Nothing too flashy, but the game plays a lot smoother.

Notable changes include:

• Reduced the random freezes later in the game due to the garbage collector being triggered
• Bats now have different states for approaching, orbiting, pausing, and lunging at the player
• Spider movement has been slightly improved
• The spell indicator always align with the crank
• The movement is now independent of refresh rate
• The lightning spell now targets the center of the enemy sprites
• Tweaked total number of enemy types on screen at once as well as the spawn timing

I've been toying with upping the refresh rate to 50 FPS. It feels noticeably smoother, but I haven't been able to hit a consistent 50 FPS yet, so I'm sticking with 30 FPS. I'll have to spend more time to see if a stable 50 FPS is achievable.