Penguins Arena: Sedna's World is a tiny (literally- 38 MB) game about penguins fighting each other with snowballs, fish-bombs and other stuff in order to push the opponent into water. Sounds like fun? Believe me- it IS a lot of fun when you play against a friend. Running around throwing snowballs at each other, trying to collect the bonus (protection against some types of attack) etc. makes you laugh in front of your PC. You need to push your opponent into water only 3 times but sometimes the game can last really long (I remember playing for around 10-15 minutes trying to score just 1 point).
On the other hand- don't expect too much. It's an indie game. Graphics are ok on max details (and you're gonna play with max details unless you're playing on a TI-82). The only problem is multiplayer. Yes, you can play with your friends but sometimes the game can't find any server. You just need to keep refreshing it and maybe restart the server. Eventually you should find it. You may also try using Steam server browser- I haven't tried it- maybe it can help. Multiplayer is dead. A running server is a rarity. Playing against bots is not challenging, so buy this game only if you're going to play it with your friends.
+ a lot fun when you play against a friend,
+ very light, a potato PC can handle it,
- dead multiplayer,
- problems with connecting to a server,
- slightly overpowered bonus,
- some weapons are a bit useless.
All in all- I recommend this game for people searching for something funny to play with their friends.