How can I make my sprite go in a circle? (like this)
Built a helper block once, should work as an example, the basic idea is changing vx/vy periodically using sin/cos. Sadly the block has several issues, sprites are not in the exact circle according to parameter radius, and get drifted away as time goes by, but works fine if making a scrolling shooter game.
Implementation is here,
Hope it helps.
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Thanks! It works pretty well.
Actually, the fact that they sprites drift out add a fun challenge to my game! 
Maybe you can with the Animation extension and using an SVG defined path? (Just an idea, I haven’t tried)