press any button to start game

I start this as a development diary for a game I aspire to make. I have taken basic classes on the concepts of design games, but 2d side scollers aren't what im looking for. I'm looking to make a first person tower defense game. it will be dark and scary at night, lots of jump scares and monsters, but by day, you try to find weapons and supplies to outfit the tower. im not sure if i want it to be a small map, a big map, scripted, sand box or what... i do, however, have a general aesthetic. black mesa industrial with grimy portal 2 age and bloody horrible Gears of war death. maybe the tower could be a light house..? not sure yet, but this is a good start! ive been sketching, ill post concept art here, i need to decide on an engine though, thankfully, most development kits are free, so i should be fine. until tomorrow.