I will update this Review, when new updates come out and things change!
I played Alpha 4.0 that just came out. So if you have seen the game before (see screenshots in the Shop!), it did change quite a bit (It will change even more in the future). Afaik the art-direction will stay like that (might change a bit).https://www.youtube.com/watch?v=o-xIarvMjTc&noredirect=1
(6 parts of cluesless gameplay)
I did play the older Versions too, but they are not representative anymore, so i cut that out at the end. Sorry, that´s the reason it has no real ending.
I like the graphics and performance was ok. You have slow-downs when you activate Boost or many Enemies are around. Imho the game runs good and playable without bigger issues (AMD X6, 8GB Ram, GTX560Ti Oc). I had absolutely no crashes or really big bugs (Textures are flickering when in window-mode).
TL/DR: Minecraft and "Drunken Robot Po.rnography" made a baby, while playing Super Mario on LSD. A lot of crazy fun and i can´t wait to get more of it and better and bigger Bosses (just saw one yet). There will be Minecraft-like crafting and building (Sandbox/Creative-Mode not integrated in 4.0) and Multiplayer.
So do i recommend it? Absolutely, if you want a crazy shooter (like explained above) and have the money to spare. If you´re not sure, where the journey will bring Spark Rising to, you should maybe wait for another update (the Dev is really quick afaik with integrating user-requested things, if they make sense though!).