Thanks! Glad you enjoyed it. The Burn options are actually abilities you sacrifice rather than upgrades, so choosing "Burn Homing" removes your homing shots. I can see how that could be confusing at first, though. I'll see if I can make it clearer after the jam.
Sorry about that. Try pressing F11, setting your browser zoom to 100% (Ctrl + 0), or checking that Windows display scaling is set to 100%. I couldn't reproduce the issue, but I'll look into it after the jam.