WattOS failed to install on a couple of different machines
Watt 5 always installed for me but Watt 6 failed to install on machines with a particular graphics card, Nvidia, if I remember correctly. The developer didn't seem to care, so I don't recommend Watt anymore.
Masonux appears a little too minimal and outdated for my tastes - seems like a lot of extra work that comes free with more developed systems. For a minimal, but still useful system, I like Crunchbang. Replace Thunar with Pcmanfm and you have essentially the LXDE desktop. Or install lxde-core and remove Thunar, xfce4-menu and xfce4-panel, and you really have the LXDE desktop. A further plus is you can install oraclejava directly with the system. You may be talking too minimal to even have a java installation, but then you might as well forget about good games without a java. How do you attract young people without games? With so little to adjust, there isn't any need for Remastersys. Finally, the Crunchbang Forum is one of the best on the Internet. With all that, I confess that I only use LMDE with LXDE.