DraStic

Are there any plans to release a demo version? I'd like to see how well it works with my devices and how the controls feel without having to pay 6 €.

Can't comment on the possibility of a demo version for sure, though I don't think there is... but... If you backup your bios/firmware files and games to the 'downloads' folder of your SD card first, so that you are ready, you could d/l the app and take use of the 48hr refund window that is offered.
I'm sure you will love it though, I've installed it on a few devices and works great on them all.

See the 2nd FAQ regarding the refund policy here:
http://www.drastic-ds.com/viewtopic.php?f=5&t=2

Thanks for the suggestion, but I really don't like asking for a refund. I guess I'll have to think about it some more and maybe take the risk and buy it even if it doesn't work well.

Update: just tried it, runs too slow (Galaxy Tab 2). I got the refund from the Play Store. Still, it would be nice if there was a demo to see if it improves with later versions (Google only refunds once).

It runs TOO SLOW??? Dude, all of my games run fullspeed or extremely close to fullspeed on a device with worse specs than the Galaxy Tab 2. I don't know how it could be too slow!

yeah i think the problem is from the android rom and need tweak

Maybe not exactly slow, but with lots of frame skipping and audio cuts, even with simple 2d screens.
I tried changing every option in the settings and it didn't affect the speed. I suspect it could have been the android rom (using stock, still not rooted).

Getting 100% speed on stock N7 2012