A nice inversion of a classic genre. Plays similarly too, counterpicking the hero units being a key part of gameplay, though you have the added lever of choosing the order and timing of your wave. This extra wrinkle was a really interesting idea. When it worked it was very satisfying, though often I had wished they moved at more similar speeds as I repeatedly tried and failed gauging when to release faster units relative to slower ones. Each level being a single wave with a set choice of unit types actually makes it play even more like a puzzle game than any from the original genre. All in all I definitely enjoyed my time with Demon Lord's Invasion, and it had an impressive level of depth for a 48 jam. Nice work!