Overall seems like a fun little progression loop, though maybe a bit challenging/harsh early on!
When pads are available to buy and be upgraded is a little unclear, and it feels unpleasant to have to manually tap to pick up the loot when you already have to tap for the main turret firing direction (on mobile -- no mouse "hover").
"roguelike" feels like maybe the wrong word for this game, it's actually an "incremental"? or perhaps you could call it both, but incremental feels more core to the game with the upgrades between runs.