collisions are 98% there

i solved some collision issues (this type of pixel-perfect game is prone to them).

basically, i introduced a variable that holds how many consecutive frames you are stuck between blocks (or the top wall). only after that variable is above a certain threshold does it count as a game over. i also tweaked some of the collision constants based on playtesting data.

now the game should be pretty fair about game overs, but if you notice a quirk, hit me up!