Good "In-between-homework" games?

Transformice?

The Hexcells series is pretty great! It's a calm, ambient & minimalist game. :)

Nimble Quest? Lol

Mountain >.>

Dungeons of Dredmor or Talisman work great as turned based so you can easily get to a stopping point.

Audiosurf and Minesweeper work fine over here :3 i would recommend even some Mount and Blade if it is your stile

Zen Bound 2....the relaxing kind of Bondage :-)

Fairy Solitaire
http://store.steampowered.com/app/38600/

Super Hexagon. It takes only a minute to beat it. Just enough for a break :D
Beat Hazard, depending of the songs.
Tetris, best game ever. If you are good at it, play sprint game mode instead(because I am capable of beating marathon, but it takes a lot of time, something like 10-20 minutes. In other words it's too much time for a break, and it doesn't help your brain to rest).

Binding of isaac if you play so good like me (im bad) it dont take long for diying :)
My longest run was 15ish min

i'm playing Risk of Rain almost every break i take from studying (and i pretty much study all day)

The Binding of Isaac and Race the Sun.

Dark Souls.

Lexica or Avoid Sensory Overload.

LYNE - puzzle game with relaxing music.

http://store.steampowered.com/app/226620/

I like Floating Point for times like those. It's free on Steam, too.

One finger death punch

Civilization V. You won't have to do your homework ever again.

Max Payne 1+2

I always played those on breaks between studying or homework.

No one sad Bad Rats yet? WTF.

Settlers online is a good one I think

fap.

someone had to say it.