I find it neat that most ranged enemy drop energy and melee drop Metal, its fun in that it kinda pushes players to mix two units always and not just focus on one unit too hard and to have a energy & metal unit, with the currency coming in two types each unit gets a power spike of 10s a little earlier or later then the other which makes each of them feel particularly powerful for a while which is really good game design especially as the power spikes are right before/after bosses, is a feels good, thank you, If you intent the game to go infinite distance would recommend a way for the player to speed up to the later 'Threat levels' as the slow walk will be a bother for players if the game gets notably longer, (even like too threat +3.0 its notably a slow walk, single scout helps tho) Thanks again, good game