Amanita Designs is having a direct download sale of their games. You must buy them in a Christmas special pack that includes both + sound tracks + artwork for $10. Standard pricing is $19.99 and $4.99 respectively. Here is a link to the sale.
These are puzzle/adventure type games with brilliant/cute/unique artwork. The site has demos for both games as does Steam. There are windows, mac and linux versions.
Machinarium has a Metacritic score of 85 and and user rating of 9.2.