Not a full recommendation, but Pronty was a nice small metroidvania. It was a nice inbetween game while waiting for larger games to play.

• You control your character and your weapon independently
• There is very little platforming as you can swim into any direction
• Enemy designs and environments were interesting in the earlier half. Environments were a bit uninspiring later on
• Took me around 8h to fully clear (excluding highest difficulty mode)