I looked at your video, I see what the others were saying. The problem is that it's easy to see the flaws in your video (simple textures, visible tiling, simple shaders, lack of water, lack of vegetation) but not the advantages (real-time huge terrains).
My suggestions are:
- Show off the hugeness of the terrains, both from a FPS and a rapid flyover view.
- Show something built using your terrains, which is a bit prettier and more interactive than your editor view. This is what the user will aim to create using your tool. Include some vegetation, some animals, a built-up area that you cleared a space for using the editor.
- Show the versatility of your tool. Think of some real-world places that it can achieve similar effects to, e.g. Mars, Tuscany, the Himalayas, the Sahara, Antartica. Do a tutorial or two of these on your site.
- Maybe pretty up your in-editor view. Fix the tiling by using larger textures or maybe doing a Perlin noise mix of two similar textures (e.g. two grass textures, two rock textures, etc). Add a simple water shader. Maybe a better lighting model and selectable skybox.
- If you're feeling adventurous, add vegetation support or the ability to have voids in the terrain (caves, arches, etc). I know this would be challenging.
- Can your tool be integrated into somebody's game to allow infinite terrain? This would be a huge plus.
The video also gave the impression that the generated terrains would be quite homogenous, e.g. many shots of infinite mountains, infinite green hills, infinite dunes. This is both a texturing thing and a terrain style thing. I realise that you can use some sort of brush tool to raise or lower an area. I have no idea if I'm a typical user, but I would love the ability to set very general generation parameters by region, e.g. draw out "this circle will be mountainous, this curve will be sand dunes, this curve will be green fields, the rest will be ocean" and the engine would just generate and blend the edges together nicely, rather than bothering myself with raising individual hills.
Maybe more feedback than you need or want, but I hope it helps.