I think my favourites indie games are Deadbolt, Project Highrise and Stardew Valley.
Deadbolt is a fast, violent but strategic side scroller. Looks like a darker version of Gunpoint. Project Highrise is a tower management game, like Sim Tower, but with more complex elements, like management of basic infraestructure (energy, water, gas etc…).
Stardew Valley is a country town simulator, at first it looks like the first Harvest Moon game, but is more free, dont have a time limit to stop playing like Harvest Moon.