Fun game!
I like the sounds and some of the skills visuals like the lightning chain between the enemy ships.
I find the control a bit too restrictive. In modern bullet hell games they often let you use the whole screen as movable space so you have a much greater degree of control of your ship. Maybe if it's meant to a be a mobile game then it's a bit different and you want to restrict the control to just left and right, then in which case the enemy bullets probably needs different behaviors.
Either way, good job on your first game and I hope you continue to improve upon it.