For the arrows I meant that if you are moving a slime horizontally into an L-match, there wouldn't be an arrow for a fireball despite a fireball needing one going to spawn.
And cascades, the main thing for me is that sometimes getting one counts down or spawns another enemy(ies), which feels a bit unfair. I can live with it not spawning fireballs if it would not do that.
Overall priority one to making the game better, I would think, is that a player would understand all the mechanics and situations that can come about. I eventually figured out most of what is going on (not when voiding happens or when the fireballs don't reach the top, I still don't know those) but I've also played match-3 related things for basically forever so it comes easier to me than it probably would to many others. A tutorial battle with explanations would go a long way.