In terms of overall gameplay experience design I'd say this is very well done even if it isn't technically finished yet.
I actually really like the concept of the game as a whole, even without the zelda themed asthetic i think this game is really fun and interesting.
My only real critisism is that I feel it gets a bit too easy the more you play it. The upgrades from the shop, especially the bomb upgrade is a little bit overpowered. Even after only upgrading it a few times I was able to clear the entire grid within 30 seconds. Maybe I'm just too good at this but still.
I'm not sure what all you plan to do with this game, but If i may make a suggestion to perhaps potentially improve this game, it would be to gradually increase the difficulty as you progress beyond simply the number of orbs needed to complete the level.
For example, maybe increasing the size of the grid. Like at the first level start with a smaller grid, like a 4x5 instead of a 5x6 and as the levels progress increase the grid size by 1 row/column.
As for the unlockable scenes, i think it'd be a bit more rewarding if each one was locked behind multiple levels instead of just one. Like instead of only having to beat a single level to get the scene, you'd have to complete maybe 3 or 5.
Combining that with my first suggestion of increasing grid size, I'd sort of picture it as you start with a small grid and when you complete x amount of levels you're rewarded with the first scene. Then the grid increases in size and you complete the same amount of levels for the second scene, and so on.
Agian, these are all just how i think you can improve the game, maybe you already plan on doing this, maybe you don't plan on this at all.
But all that aside, I do love how you've developed this game. It's fun, creative, and hella addictive (i spent 3 whole hours playing this lol). And I really look forward to seeing what you do with it in the future.
(sorry if this seems a bit long)