What this is

You walk a procedural medieval dungeon — torchlit corridors, vaulted chambers, stone pillars, water pools. Two robed hands visible at the bottom corners of your view, glowing with the spell currently equipped. Left and right mouse cast independently. Q swaps which hand the number keys assign. Five spells: arcing fireball with AoE explosion, ice wall that becomes real collision blocking enemies, chain lightning with up to 4 jumps, cone-shaped force push, golden heal pulse with brief invulnerability. Skeletons lurch toward you with swords. Skeleton mages fire bone projectiles. The Bone Lord at the end has 600 HP and a 3-bone spread pattern. Defeat him to win.

Why this is mind-blowing

Magic systems in games are usually a button you press. This one treats spells like real components — chargeable, two-handed, combinable, with the iconic "fire in one hand, ice in the other" wizard fantasy intact. From one paragraph.