added plan.txt

plan.txt

+enemies:
+	flying demon (vertical moving)
+	fire demon
+	horiztonal demon
+	tack shooter (spike demon)
+	stalagtite
+	stalagmite
+	turret
+	laser fence
+
+platforms:
+	static
+	moving horizontally
+	moving vertically
+	flipping triangle
+	spinning moving (spinning cum)
+	tilted
+	ladders
+
+other challenges:
+	hard jumps
+	precise jumps? like if you land too far you hit an enemy
+	minor bullet hell
+	
+levels: which things are introduced in which level
+	tutorial: flying demon, checkpoints, static, fire demon
+	1: platform moving horizontally, ladders
+	2: tilted platforms, platform moving vertically
+	3: horiztonal demon, tack shooter
+	4: flipping triangle
+	5: spinning moving platform, staggered tack shooters
+	6: stalagtite, stalagmite, minor chaos
+	7: turret, staggered stalagmites and stalagtites
+	8: laser fence
+	9: like level 8 but harder, more laser fences
+	10: bigger chaos
+	11: dyl*n
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