I'm ready to play
I'm assuming that's Jack Deadly, right?
I have now played and enjoyed all entries except for one that didn't have a Linux version or ran in WINE. Would it be unfair if I voted you think? WINE could potentially cause the games to run badly, but I didn't notice anything wrong or buggy so that shouldn't be an issue. Sadly I can't get to a Windows machine before voting time is over, everyone I know who lives close to me runs Linux as well.
I'd say vote, the participants that went the extra mile to provide different formats are deserving of your assessments
Many popular game jams are with a large number of entries submitted from contestants. Those voters(or gamers who rate entries) need to play or try all entries before they vote(or rate). Not possible.
Think you know that feeling: ok, this was the best - oh but there was this game which did xyz so nicely. No, still this is the best but then this becomes second but wait, second you already had this game ... so you order stuff around and try to find bad things to explain ratings to yourself - and then remember the good stuff and ... argh ;-)
Placed my votes - we had some nice entries this time so I nearly preferred to ask for 5 ranks to set - as it is cruel to know that #4 and #5 (and #6 and ...) are also cool and just missed a place below the "best 3".