For your search for lesser-known games, I’m sharing Virus Survivors on behalf of Portal Rabbit. It’s a free browser demo that mixes active aiming and shooting with building and upgrading a fortress against enemy swarms, so it may suit someone who likes both action and defensive planning.
It’s in development and uses generative AI assistance. Desktop is recommended; no download or game account is needed: https://portalrabbit.com/games/virus-survivors/