This is the free version of the BubbleTown tileset. Suggested for platformers. The full version will come soon. It will include many other things such as keys, buttons, coins, spikes, environmental decorations, and way more! As well as a full 47 tile tileset, that you can set up as an autotile (As shown in the second slide). And yeah the quality is way better but game maker has super strict screenshot requirements.
End User Licence Agreement (EULA).